/*
 * Copyright 2007-2009 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.paoding.rose.web.instruction;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.paoding.rose.web.impl.thread.Path;
import net.paoding.rose.web.var.PrivateVar;

public class ForwardInstruction extends AbstractInstruction {

	private String path;

	private String modulePath() {
		Path path = PrivateVar.invocationVariables().getPath();
		return path.getModule();
	}

	public ForwardInstruction module(String module) {
		if (module.length() > 0 && module.charAt(0) != '/') {
			module = "/" + module;
		}
		path(module);
		return this;
	}

	public ForwardInstruction controller(String controller) {
		if (controller.length() > 0 && controller.charAt(0) != '/') {
			controller = "/" + controller;
		}
		path(modulePath() + controller);
		return this;
	}

	public ForwardInstruction action(String action) {
		if (action.length() > 0 && action.charAt(0) != '/') {
			action = "/" + action;
		}
		Path pathResolver = PrivateVar.invocationVariables().getPath();
		path(modulePath() + pathResolver.getController() + action);
		return this;
	}

	public String path() {
		return path;
	}

	public ForwardInstruction path(String path) {
		this.path = resolvePlaceHolder(path);
		return this;
	}

	@Override
	public void render(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.getRequestDispatcher(path).forward(request, response);
	}
}
